Google made headlines this week by revealing its fully autonomous car prototypes. These are not the modified self-driving vehicles that the tech giant has been experimenting with for years, but new machines that lack any kind of driver controls whatsoever.

Google wants to revolutionize the car business. The business model, if they can get it going, wouldn’t be as a traditional automaker. It’d be more like a service they’d sell to cities – think cabs or Uber. But the business graveyard is littered with automakers who wanted to change the car business.